Bui. 121, Forest Service, U. S. Dept. of Agriculture. 



Plate VI. 



< 



^ 



I 









h- 



o 



< 





UJ w 



o 



z ^ 



•~ 



dSi 



cU 



v> 





^00 



a) '~~ 



-5 Ll 



r;^i 



li. o 





^ u 



^=^ 



o o 



z< 



->-> 



^- UJ 



?-• 





c;ih 



II 



